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Fix compiler warnings around _CRT_glob
Newer compilers warned about extern int _CRT_glob = 0;which is indeed a mysterious C construction, as it combines "extern"and an initialization. It turns out that according to the C standard,the "extern" is ignored here, so we can remove it to resolve thewarnings. But then we also need to add a real externdeclaration (without initializer) to satisfy-Wmissing-variable-declarations.(Note that this code is only active on MinGW.)Discussion:https://www.postgresql.org/message-id/1053279b-da01-4eb4-b7a3-da6b5d8f73d1%40eisentraut.org1 parent3a66158 commit3e908fb
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